Blogs are public websites that serve as journals for individuals, reflecting their opinions, thoughts and views on various topics and subjects ranging from politics to current events to news about products, happenings, people etc. Blogs are a combination of text, images and links to other related websites, and are updated at frequent intervals. The blog entries are displayed in a reverse chronological order and provide users with the opportunity to post comments on the entries and carry out a discussion on the same with other like minded individuals.

A wide variety of blogging software tools are available that enable users to easily create, design and maintain their blogs. Some of the popular blogging tools include the following: Blogsphere, Blogger, Greymatter, Movable Type and Open Diary.

Blogs can be created as an add-on to a website in order to promote and increase visibility of the site in search engines. Typically, the site architecture of a blog is simple, with clear and easy navigation and back-links from every page, thereby making it easier to be crawled and ranked by search engines. Blogs can be used to target desired keywords and phrases as it is easier to maintain the optimum keyword density through content, blog entry titles, categories etc. The frequency of blog updates ensures that it is crawled by the search engines more often.